Lock.



(No. Model.)

i. M. Huur. LUG K.

(Application led Juno 13, 1900.)

Patented-1an.l, |90I.

UNITED` STATES PATENT OFFICE.

EARL M. HUNT, OF MINNEAPOLIS, MINNESOTA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 665,099, dated January 1, 1901.

Application filed June 13, 1900.

To all whom it may concern:

Be it known that I, EARL M. HUNT, a citizen of the United States, residing at Minneapolis, in the county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to locks in general, and more particularly to combination-locks, and it has specific reference to that class of door-locks which are operated by knobs, one object of the invention being to provide a simple and efficient form of lock wherein the combination may be set by manipulation of the sections of which the knob is formed, together with a supplemental ring.

A further object of the invention is to so arrange the parts that the lock may be operated in the usual manner by turning a simple form of knob on the inside.

Further objects and advantages will be evident from the following description:

In the drawings forming a portion of this specication, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a view showing one of the plates of the lock removed to expose the Working parts of the mechanism, which latter are shown in elevation. Fig. 2 is a section on line 2 2 of Fig. lof the drawings and including both knob-spindles of the lock. Fig. 3 is a detail view.

Referring now to the drawings, the lock mechanism is inclosed in a preferably rectangular casin g 5, to which are secured the usual front and back plates 6 and 7, in which are formed alining openings 8 and 9, which form bearings for the two knob-spindles 10 and 11. In the front side of the casing is a rectangular opening 12, through which is passed the locking-bolt 13, which is held normally projected by means of a helical spring14, which bears at one end against the rear end of the bolt and at the opposite end against the inner face' of the back of the casing. y

The knob-spindle 11 comprises an interior shaft 15, a tubular shaft 16, disposed upon the shaft 15, and a third tubular shaft 17, disposed upon the shaft 16, and upon the ends serial No. 20,196. No modus of these three shafts and within the casing 5 are fixed three disks 18, 19, and 20, the disk 19 having a central opening for the passage of shaft 15 therethrough and the disk 20 having also a central opening for the passage of shafts 15 and 16. The disks 18, 19, and 2O are in axial alinement and are of equal diameters, and each has a notch 21 in its periphery, which are adapted to aline transversely of the disks when the disks are properly positioned. When the notches of the disks are thus alined, they are adapted to receive the tongue of a latch-shaped tumbler 22, which'is pivoted to the rear end of the bolt, and the notches are so formed that when the tumbler is in engagement therewith the disks may be rotated rearwardly to draw the bolt against the tendency ofthe helical spring 14. If lone of the disks be then rotated in an opposite direction, the tumbler will be moved outwardly from engagement with the notches, and the helical spring will press the bolt forwardly and into locking position. To accomplish this result, when a disk is moved reversely the notches are similar, formed by one cut extending radially of each disk and one cut at an angle to the radial cut, the outer end of the cut or-the resultant wall of the slot being arc-shaped, as shown. To manipulate these disks independently of each other to cause their several notches to aline and permit withdrawal of the locking-bolt, a knob-section 24 is fixed to the outer end of the shaft 15, which knob has its second section xed to the tubular shaft 16, the knob-sections lying close together, as shown, whereby they may be simultaneously grasped and operated when desired. shaft 17 is operated by means of a ring 25, iixed thereon, the knob-sections and the ring being preferably milled to facilitate manipulation. The knob-sections and the ring, as also the collar 26, which encircles the spindle and is secured against the face of the door, are each provided with a series of raised numerals which may be seen in the daytime and may be felt at night and which when properlyalined will indicate registration of the' notches in the disks, so that the knob may be then operated to draw the bolt.

In order to permit opening of the door from the inside without necessitating operation of the combination, a separate knob 27 is used,

The

IOO

to, a series of disks in axial alinement andm having each a notch disposed to register at times and receive engagement of the tumbler to draw the bolt When the disks are rotated in one direction, concentric shafts connected With the disks for operating them independently, and carrying indexes, a shaft having a crank-arrn, and a link pivoted to the bolt and to the last-named shaft, whereby the bolt may be drawn thereby independently of the positions of the disks and tumbler.

2. A combination-lock comprising a reciprocatory bolt having a tumbler pivoted thereto, a spring disposed to hold the bolt normally projected, a series of disks having each a notch of which one Wall lies radially of the disk and the other Wall lies at an angle to the radial wall and has its outer portion areshaped, said notches being adapted for alinement to receive the tumbler,concent1ic shafts .Connected with the disks to operate them independently in either direction to draw the bolt or to release the bolt, a shaft having a crankarm, and a link connecting the crank-arm With the bolt, to retract the bolt independently of the disks and the shafts connected 35 therewith.

EARL M. HUNT.

Witnesses:

WM. B. HENDERSON, GEO. O. STORER. 

